如何使用Java實現CMS系統的使用者管理功能
隨著資訊科技的發展,內容管理系統(Content Management System,簡稱CMS)在網路應用中扮演著重要的角色。在一個完善的CMS系統中,使用者管理是一個不可或缺的功能,它可以實現使用者的註冊、登入、權限控制等操作。本文將介紹如何使用Java語言實作CMS系統的使用者管理功能,並提供對應的程式碼範例。
首先,我們需要設計資料庫表格以儲存使用者相關的資訊。常見的使用者表通常包括id、使用者名稱、密碼、郵箱、註冊時間等欄位。可以使用MySQL資料庫,並建立一個名為"users"的表,表結構如下:
CREATE TABLE users ( id INT AUTO_INCREMENT PRIMARY KEY, username VARCHAR(50) NOT NULL, password VARCHAR(50) NOT NULL, email VARCHAR(50) NOT NULL, createdAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP );
import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; public class UserRegistration { public static void main(String[] args) { String url = "jdbc:mysql://localhost:3306/cms"; String username = "root"; String password = "password"; try { Connection connection = DriverManager.getConnection(url, username, password); String sql = "INSERT INTO users (username, password, email) VALUES (?, ?, ?)"; PreparedStatement statement = connection.prepareStatement(sql); statement.setString(1, "john"); statement.setString(2, "password123"); statement.setString(3, "john@example.com"); int rowsInserted = statement.executeUpdate(); if (rowsInserted > 0) { System.out.println("User registered successfully!"); } } catch (SQLException e) { e.printStackTrace(); } } }
import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class UserLogin { public static void main(String[] args) { String url = "jdbc:mysql://localhost:3306/cms"; String username = "root"; String password = "password"; try { Connection connection = DriverManager.getConnection(url, username, password); String sql = "SELECT * FROM users WHERE username = ? AND password = ?"; PreparedStatement statement = connection.prepareStatement(sql); statement.setString(1, "john"); statement.setString(2, "password123"); ResultSet resultSet = statement.executeQuery(); if (resultSet.next()) { System.out.println("User logged in successfully!"); } else { System.out.println("Invalid username or password!"); } } catch (SQLException e) { e.printStackTrace(); } } }
import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class AccessControl { public static void main(String[] args) { String url = "jdbc:mysql://localhost:3306/cms"; String username = "root"; String password = "password"; try { Connection connection = DriverManager.getConnection(url, username, password); String sql = "SELECT * FROM users WHERE username = ?"; PreparedStatement statement = connection.prepareStatement(sql); statement.setString(1, "john"); ResultSet resultSet = statement.executeQuery(); if (resultSet.next()) { String role = resultSet.getString("role"); if ("admin".equals(role)) { System.out.println("User has admin privileges!"); } else { System.out.println("User has regular privileges!"); } } else { System.out.println("User not found!"); } } catch (SQLException e) { e.printStackTrace(); } } }
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